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Reinsurance - Components of Net Investment Income on Funds Withheld Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reinsurance |  |  |
Gross investment income | $ 1,103.1 | $ 1,109.9 | $ 869.9
Investment expenses | (35.8) | (23.7) | (20.5)
Net investment income | 1,067.3 | 1,086.2 | 849.4
Fixed maturities, available-for-sale |  |  |
Reinsurance |  |  |
Gross investment income | 825.9 | 856.9 | 745.9
Fixed maturities, trading |  |  |
Reinsurance |  |  |
Gross investment income | 21.5 | 11.9 | 2.0
Equity securities |  |  |
Reinsurance |  |  |
Gross investment income |  | 0.2 | 0.6
Mortgage loans |  |  |
Reinsurance |  |  |
Gross investment income | 114.7 | 119.0 | 98.4
Cash and cash equivalents |  |  |
Reinsurance |  |  |
Gross investment income | 52.8 | 57.9 | 18.2
Other |  |  |
Reinsurance |  |  |
Gross investment income | $ 88.2 | $ 64.0 | $ 4.8

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Income on funds withheld assets passed to coinsurer, derived from investments and on cash and cash equivalents, net of amortization of purchase discounts and premiums related to investments in debt securities. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. The purchase discount or premium is amortized to income or expense, respectively, over the life (holding period) of the securities to arrive at an amount of periodic interest income or expense which results in a constant effective yield on the investments. + References No definition available. + Details
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- Definition Amount of expenses related to the generation of investment income on funds withheld assets. + References No definition available. + Details
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- Definition Amount, after investment expense, of income on funds withheld assets passed to coinsurer earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References No definition available. + Details
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